Effects of central depressants on the cortical auditory responses in the unrestrained cats.

In the previous paper (1-4), we have been able to demonstrate systematically the relationship between the cortical auditory responses evoked by clicks and the level of consciousness in the acute encephale isole preparations of cat. Furthermore, the effects of several central depressants on the evoked responses in the central auditory system caused by single and repetitive click stimuli have been studied in the acute prepara tions. Although the auditory responses in unanesthetized, unrestrained animals have been observed by several investigators (5-9), influence of the central depressants on these res